Collapsible core.



W. R, DENMAN. COLLAPSIBLE come. APPLICATI'ON FILED SEPT. 14, 1915- Patented Feb. 1,1916.

Walter fi. fienmwng To all whom it mag concern? segmental core as is-used in the construction v w1th acentrallylocated annular groove 5 UNITED STA WALTER 'It. DENMAN,

OFFICE.

or AKRON, OHIO, assmironro mm-ma 11mm ommas, or 'AKBOE'OHIO, cone ORATION ior .cnxo.

- cotmsmnn coma;

'- Application fi1e lSeptember,I4, 1915,- Serialflhq50fi43,

' Be it known that I, IVALTER R. DEi-WMAN,

a citizen of the "United States, residing at Akron, in the' county of' Sum'mit and State .of Ohio,1hav'e invented certain new; and useful "Improvements in Collapsible Cores,' cofwhich the following is a-specification;

The present invention relates to improve ments in collapsible cores, or mandrels, and

pertains more'particularly tothat type of of pneumatic tire shoes. .The' principal object ofthe invention is to provide a collapsible core-composed of segments which,-when assembled, will con form to the inner contour of a tire-shoe, and

thus provide a suitable space within the tire' I tangula'rshape of the groove. and having 1 casing for the inner pneumatic tube. j

Further objects of the invention consist in providing a core of thetype above set forth which can-be easilyand-quickly withdrawn from'the finished tire casing, yet one which,

invention consists of the combination and arrangement of parts morefully set forth in.

the following specification, illustrated, in the accompanying drawings, and pointed out in the appended claims. I

In the drawings, Figure l is a planview ofthe assembled core; Fig; 2 is an'enlarged transverse section on line -22 of Fig; 1; and Fig.3 is an enlarged fragmental section of a detail.. I

Referring to the drawings, the main core is composed of a plurality of solid segments adapted to be secured end to end to form, when assembled, a complete ring core corresponding in size and shape to the inner dimensions of the finished shoe or casing. In the form shown in accompanying drawings, four such segments 1, 2, 3 and at are provided. The exact number and arrange ment of segments may be varied 'at will/ In order to facilitate the disassemblingof the parts, one of the core'segments 1 is formed with beveled ends 1 diverging outwardly away from the center of the ring core. The two adjacent segments 2 and 4 are provided each with one beveled end 2 and 4 adapted to contact with the beveled end 1 of the segment 1. The opposite ends 2* and 4 of the segments 2 and 4 respectively are squared,

and are adapted toffit'against the similarly squaredends '3 and 3? of the fourth segment 3.. Segments, 1. and-3 are provided'at their ends withprojecting lobes or plates 1' and 3 which are adapted'to slide inwardly into suitably tormedslots Wand-4? at the inner ends of the segments 2 and 4 'resp ectively.

' Additional means for-securing the parts.

togetherimtheir assembled form consistiof asteel band ring also ,formed-in segments. I Eachfof the four. core segments is provided 1; of substantially ,arectangular cross-section at its outer periphery. A segmental steel band comprising three segments 6*, 6 and 6 is provided, the several parts be-ing .formed with cross, sections corresponding to the rectheir exterior surfaces curved to conform wlth the contour-of the-outer surface of. the core segments. Two of the segments v6 and Patented Feb. 1,1916.

6, are formed each withl.one beveled end Gf' 6?, adapted to overlap in a manner lar to the several core segment ends. The

squared, as shown."

other ends of the ring segments are all- The ring segments are provided with screw threaded bores 9 extending radially inwardat corresponding intervals-adapted to re-.

simi- I The'several core segments are provided. I

Iceive the threadedinner" ends of the bolts ;8, I

and thereby clamp thering'segments se- ,curely around the core'segments. It will be seenthat the joints of the ring segments do not coincide with the coresegment joints,

but the arrangement is such that the ring segments overlap the core segments.

From the above description itwill be seen that the core segments'are assembled by being placed end to end withthe lobes 1 and 3 fitted into the slots 2Iand 4. The ring $egadjoining ends. of the .mentsfi 6 and 6? are then placed in the annular groovesj, and bolted in place by.

the bolts 8. After. thetire shoe or casing has been built up around the :'core,the parts are disassembled and withdrawn through. the inner circumferential opening ia the-fola lowing manner The bolts 8 are first -unscrewed and withdrawn, loosening the core segments from the. outer rlng' se'iments.

The core segments 1, :2, 3 and 4 are tien re moved in the order named, after which the ring segments are'gsiniilarly withtlrawn.

By constructing'the parts and assembling them in the manner setforth, a. collapslble 7 core is provided which can be quickly and easily taken apart andremoved. The pro-' vision of the outer steel band insert further insures a rigid structl'u-e upon which I COId tire carcass can be built, and one which will 'be incapable of *zirping or bulging.

Having described my invention what I claim is 1. A; collapsible core comprising a plurality of separable segments and retaining means extending on the peripheryrcircumferentially thereof. v s

2. A collap ible core comprising a pluralityr of separable segments having intereach provided with an annular groove, and a retaining band ,extendingon vthe periphery c1rcumferent ally;of said core and fitting said annular grooves.

5. A collapsible core comprising a plurality of separablesegments formed with an annular groove at their outer circumference; a retainingband' encircling said core segments and fitting said annular groove.

6. A collapsible" core comprising a pill- :rality of separable segments, said segments bein rovided with an annular mom-e in their outer circumference, a segmental rerality of separable segn'ients having interlocking end connections, said segments being provided with an annular groove at the outer circi'lmference of the core, a segmental retaining band disposed within said annular groove, the segments of said retainingband ot'erlapping the joints of the core segn'ients, and means for detachably securing said core segments to said band segments. r

In testimonvwhereof I atfix my signature in presence of two witnesses.

' XV ALTER R. DEIQMAN.

Vitnesses C. A. /VoLr, J. C. \Voonwaun.

Copiesof, this patent me? be obtained for five cents each, by a'd dressing the Commissioner ofpPatents,

- Washington, D. C. 

